You probably have a scientific calculator with you with sin, cos, tan function which you will never use unless you are a college or high school student doing homework at the supermarket. A calculator for daily usage or even in business should be more practical, don´t you think?
You should be able to figure out how much you should tip your waiter, based on percentage, without having to come up with complex procedure on how to operate that into your calculator. What if I told you that there actually is a calculator that can tell you what is the percentage of your salary raise, if you are lucky to get one, without having to pull out a 100-page manual on how to do that? Calculator 365+ iPhone iPad Review
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